BISC208 Lecture Notes - Lecture 15: Community Structure, Ecosystem Ecology, Density Dependence
19 Sep 2018
School
Department
Course
Professor
Document Summary
Introduction to ecology: sockeye salmon example, organismal ecology i. ii. Salmon migrate from saltwater to freshwater environments to breed: population ecology i. ii. On average, only a few offspring will survive to return to the same stream to breed: community ecology i. ii. Salmons are prey as well as predators d. Salmon die and then decompose, releasing nutrients that are used by other organisms: global ecology. How is the biosphere affected by global changes in nutrient cycling and climate? i: worldwide populations of salmon are affected by climate change. Biotic factors: the distribution of a species is often limited by biotic ( living ) factors, or interactions with other, competition, reproductive requirements, parasitism, and other interactions can affect the organisms distribution of a species. Native ant populations remain in dry areas: all species are limited by historic and current biotic and abiotic factors.
